#include "StdAfx.h"
#include ".\md5encrypt.h"

CMD5Encrypt::CMD5Encrypt(void)
{
	MD5Init();
}

CMD5Encrypt::~CMD5Encrypt(void)
{
}
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void CMD5Encrypt::MD5Init()
{
	this->m_iCountArray[0] = this->m_iCountArray[1] = 0;
	/* Load magic initialization constants.*/
	this->m_iStateArray[0] = 0x67452301;
	this->m_iStateArray[1] = 0xefcdab89;
	this->m_iStateArray[2] = 0x98badcfe;
	this->m_iStateArray[3] = 0x10325476;
	/* Add by Liguangyi */
	MD5_memset(m_pszPadding, 0, sizeof(m_pszPadding));
	*m_pszPadding=0x80;
	//m_pszPadding = {
	//	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	//	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	//	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0	};
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void CMD5Encrypt::MD5Update (unsigned char *input,unsigned int inputLen)
{
	unsigned int i, index, partLen;

	/* Compute number of bytes mod 64 */
	index = (unsigned int)((this->m_iCountArray[0] >> 3) & 0x3F);

	/* Update number of bits */
	if ((this->m_iCountArray[0] += ((unsigned long int)inputLen << 3))
		< ((unsigned long int)inputLen << 3))
		this->m_iCountArray[1]++;
	this->m_iCountArray[1] += ((unsigned long int)inputLen >> 29);

	partLen = 64 - index;

	/* Transform as many times as possible.
	*/
	if (inputLen >= partLen) {
		MD5_memcpy((unsigned char*)&this->m_pszBuffer[index], 
			(unsigned char*)input, partLen);
		MD5Transform (this->m_iStateArray, this->m_pszBuffer);

		for (i = partLen; i + 63 < inputLen; i += 64)
			MD5Transform (this->m_iStateArray, &input[i]);

		index = 0;
	}
	else
		i = 0;

	/* Buffer remaining input */
	MD5_memcpy ((unsigned char*)&this->m_pszBuffer[index], (unsigned char*)&input[i], inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
the message digest and zeroizing the context.
*/
void CMD5Encrypt::MD5Final (unsigned char digest[16])
{
	unsigned char bits[8];
	unsigned int index, padLen;

	/* Save number of bits */
	Encode (bits, this->m_iCountArray, 8);

	/* Pad out to 56 mod 64.
	*/
	index = (unsigned int)((this->m_iCountArray[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	MD5Update ( m_pszPadding, padLen);

	/* Append length (before padding) */
	MD5Update (bits, 8);
	/* Store state in digest */
	Encode (digest, this->m_iStateArray, 16);

	/* Zeroize sensitive information.
	*/
	MD5_memset ((unsigned char*)this, 0, sizeof (*this));
	this->MD5Init();
}


/* MD5 basic transformation. Transforms state based on block.
*/
void CMD5Encrypt::MD5Transform (unsigned long int m_iStateArray[4], unsigned char block[64])
{
	unsigned long int a = m_iStateArray[0], b = m_iStateArray[1], c = m_iStateArray[2], d = m_iStateArray[3], x[16];

	Decode (x, block, 64);

	/* Round 1 */
	FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
	FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
	FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
	FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
	FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
	FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
	FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
	FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
	FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
	FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
	FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
	FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
	FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
	FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
	FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
	FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

	/* Round 2 */
	GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
	GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
	GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
	GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
	GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
	GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
	GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
	GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
	GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
	GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
	GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
	GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
	GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
	GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
	GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
	GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

	/* Round 3 */
	HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
	HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
	HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
	HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
	HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
	HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
	HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
	HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
	HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
	HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
	HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
	HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
	HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
	HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
	HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
	HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

	/* Round 4 */
	II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
	II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
	II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
	II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
	II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
	II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
	II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
	II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
	II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
	II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
	II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
	II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
	II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
	II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
	II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
	II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

	m_iStateArray[0] += a;
	m_iStateArray[1] += b;
	m_iStateArray[2] += c;
	m_iStateArray[3] += d;

	/* Zeroize sensitive information.
	*/
	MD5_memset ((unsigned char*)x, 0, sizeof (x));
}

/* Encodes input (unsigned long int) into output (unsigned char). Assumes len is
a multiple of 4.
DWordToByte
*/
void CMD5Encrypt::Encode (unsigned char *output, unsigned long int *input,unsigned int len)
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4) {
		output[j] = (unsigned char)(input[i] & 0xff);
		output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
		output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
		output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
	}
}

/* Decodes input (unsigned char) into output (unsigned long int). Assumes len is
a multiple of 4.
ByteToDWord
*/
void CMD5Encrypt::Decode (unsigned long int *output, unsigned char *input, unsigned int len)
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4)
		output[i] = ((unsigned long int)input[j]) | (((unsigned long int)input[j+1]) << 8) |
		(((unsigned long int)input[j+2]) << 16) | (((unsigned long int)input[j+3]) << 24);
}

/* Note: Replace "for loop" with standard memcpy if possible.
*/

void CMD5Encrypt::MD5_memcpy (unsigned char* output, unsigned char* input,unsigned int len)
{
	unsigned int i;

	for (i = 0; i < len; i++)
		output[i] = input[i];
}

/* Note: Replace "for loop" with standard memset if possible.
*/
void CMD5Encrypt::MD5_memset (unsigned char* output,int value,unsigned int len)
{
	unsigned int i;

	for (i = 0; i < len; i++)
		((char *)output)[i] = (char)value;
}
#ifdef WIN32
CString CMD5Encrypt::MD5Final()
{
	BYTE md5Checksum[16] = {0};
	MD5Final(md5Checksum);

	CString strMD5Checksum = _T("");
	for (register int i = 0; i < 16; ++i)
	{
		strMD5Checksum.AppendFormat("%02x",md5Checksum[i]);
	}
	ASSERT( strMD5Checksum.GetLength() == 32 );
	return strMD5Checksum;
}
CString CMD5Encrypt::GetMD5Checksum( CFile &file )
{
	try
	{	
		CMD5Encrypt MD5Checksum;			//checksum object	
		int iLength = 0;							//number of bytes read from the file
		const int iBufferSize = 1024;	//checksum the file in blocks of 1024 bytes
		BYTE buffer[iBufferSize] = {0};			//buffer for data read from the file

		//checksum the file in blocks of 1024 bytes
		while ((iLength = file.Read(buffer,iBufferSize)) > 0 )
		{	
			MD5Checksum.MD5Update(buffer,iLength );
		}

		//finalise the checksum and return it
		return MD5Checksum.MD5Final();
	}
	//report any file exceptions in debug mode only
	catch (...)
	{	
		TRACE0("CMD5Encrypt::GetMD5Checksum: CFileException caught");	
		throw;
	}
}

CString CMD5Encrypt::GetMD5Checksum( CString strString)
{
	try
	{	
		CMD5Encrypt MD5Checksum;			//checksum object	
		int iLength = strString.GetLength();							//number of bytes read from the file
		
		BYTE *pBuffer = (BYTE*)(strString.GetBuffer(iLength));			//buffer for data read from the file

		MD5Checksum.MD5Update(pBuffer,iLength );
		//finalise the checksum and return it
		return MD5Checksum.MD5Final();
	}

	//report any file exceptions in debug mode only
	catch (...)
	{	
		TRACE0("CMD5Encrypt::GetMD5Checksum");	
		throw;
	}
}
#endif

#ifdef _DEBUG
bool CMD5Encrypt::DoUnitTest()
{
#ifdef WIN32
	printf("%s\r\n",GetMD5Checksum("zhenghuabo"));
	printf("%s\r\n",GetMD5Checksum("zhenghuabo"));
	CFile file;
	file.Open("C:\\abc.xml",CFile::modeReadWrite);
	printf("%s\r\n",GetMD5Checksum(file));
	file.SeekToBegin();
	printf("%s\r\n",GetMD5Checksum(file));

	file.SeekToEnd();
	file.Write("just a test",14);
	file.Flush();
	printf("%s\r\n",GetMD5Checksum(file));
	file.Close();


#endif
	return true;
}
#endif